18 resultados para Nilpotent-by-Finite Group

em Doria (National Library of Finland DSpace Services) - National Library of Finland, Finland


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Granular flow phenomena are frequently encountered in the design of process and industrial plants in the traditional fields of the chemical, nuclear and oil industries as well as in other activities such as food and materials handling. Multi-phase flow is one important branch of the granular flow. Granular materials have unusual kinds of behavior compared to normal materials, either solids or fluids. Although some of the characteristics are still not well-known yet, one thing is confirmed: the particle-particle interaction plays a key role in the dynamics of granular materials, especially for dense granular materials. At the beginning of this thesis, detailed illustration of developing two models for describing the interaction based on the results of finite-element simulation, dimension analysis and numerical simulation is presented. The first model is used to describing the normal collision of viscoelastic particles. Based on some existent models, more parameters are added to this model, which make the model predict the experimental results more accurately. The second model is used for oblique collision, which include the effects from tangential velocity, angular velocity and surface friction based on Coulomb's law. The theoretical predictions of this model are in agreement with those by finite-element simulation. I n the latter chapters of this thesis, the models are used to predict industrial granular flow and the agreement between the simulations and experiments also shows the validation of the new model. The first case presents the simulation of granular flow passing over a circular obstacle. The simulations successfully predict the existence of a parabolic steady layer and show how the characteristics of the particles, such as coefficients of restitution and surface friction affect the separation results. The second case is a spinning container filled with granular material. Employing the previous models, the simulation could also reproduce experimentally observed phenomena, such as a depression in the center of a high frequency rotation. The third application is about gas-solid mixed flow in a vertically vibrated device. Gas phase motion is added to coherence with the particle motion. The governing equations of the gas phase are solved by using the Large eddy simulation (LES) and particle motion is predicted by using the Lagrangian method. The simulation predicted some pattern formation reported by experiment.

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Early identification of beginning readers at risk of developing reading and writing difficulties plays an important role in the prevention and provision of appropriate intervention. In Tanzania, as in other countries, there are children in schools who are at risk of developing reading and writing difficulties. Many of these children complete school without being identified and without proper and relevant support. The main language in Tanzania is Kiswahili, a transparent language. Contextually relevant, reliable and valid instruments of identification are needed in Tanzanian schools. This study aimed at the construction and validation of a group-based screening instrument in the Kiswahili language for identifying beginning readers at risk of reading and writing difficulties. In studying the function of the test there was special interest in analyzing the explanatory power of certain contextual factors related to the home and school. Halfway through grade one, 337 children from four purposively selected primary schools in Morogoro municipality were screened with a group test consisting of 7 subscales measuring phonological awareness, word and letter knowledge and spelling. A questionnaire about background factors and the home and school environments related to literacy was also used. The schools were chosen based on performance status (i.e. high, good, average and low performing schools) in order to include variation. For validation, 64 children were chosen from the original sample to take an individual test measuring nonsense word reading, word reading, actual text reading, one-minute reading and writing. School marks from grade one and a follow-up test half way through grade two were also used for validation. The correlations between the results from the group test and the three measures used for validation were very high (.83-.95). Content validity of the group test was established by using items drawn from authorized text books for reading in grade one. Construct validity was analyzed through item analysis and principal component analysis. The difficulty level of most items in both the group test and the follow-up test was good. The items also discriminated well. Principal component analysis revealed one powerful latent dimension (initial literacy factor), accounting for 93% of the variance. This implies that it could be possible to use any set of the subtests of the group test for screening and prediction. The K-Means cluster analysis revealed four clusters: at-risk children, strugglers, readers and good readers. The main concern in this study was with the groups of at-risk children (24%) and strugglers (22%), who need the most assistance. The predictive validity of the group test was analyzed by correlating the measures from the two school years and by cross tabulating grade one and grade two clusters. All the correlations were positive and very high, and 94% of the at-risk children in grade two were already identified in the group test in grade one. The explanatory power of some of the home and school factors was very strong. The number of books at home accounted for 38% of the variance in reading and writing ability measured by the group test. Parents´ reading ability and the support children received at home for schoolwork were also influential factors. Among the studied school factors school attendance had the strongest explanatory power, accounting for 21% of the variance in reading and writing ability. Having been in nursery school was also of importance. Based on the findings in the study a short version of the group test was created. It is suggested for use in the screening processes in grade one aiming at identifying children at risk of reading and writing difficulties in the Tanzanian context. Suggestions for further research as well as for actions for improving the literacy skills of Tanzanian children are presented.

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The present Master’s thesis presents theoretical description of the extraodinary behavior of the confined Indium nanoparticles. Superconducting properties of nanoparticles and nanocomposites are extensively reviewed. Special attention has been paid to phase fluctuation, shell and disordered effects. The experimental data has been obtained and provided by Dmitry Shamshur from Ioffe Physical Technical Institute. The investigated material represents a highly ordered system of silicate spheres filled with indium metal, where the In nanoparticles are interconnected between each other. Bulk indium is a superconductor with crititcal superconducting temperature Tc0 = 3:41 K. But indium nanoparticles exhibit different behavior, the critical temperature rise by approximately 20% up to 4.15 K. As well as transition of the indium particles to type-II superconductivity with high critical magnetic fields. Such diversity is explained by finite size effects which originate from nanosize of the samples.

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Diplomityössä tutustutaan napakäämittyihin murtovakokestomagneettitahtikoneisiin sekä syvennytään niiden suunnitteluun analyyttisen laskennanavulla. Analyyttisen laskennan haasteena on perinteisesti käytettyjen kestomagneettitahtikoneiden laskentayhtälöiden sovittaminen murtovakokäämityille kestomagneettitahtikoneille. Työn lopussa analyyttisen laskennan tuloksia verrataan kenttälaskentaohjelmalla saatuihin tuloksiin. Tärkeimmät analyyttiset yhtälöt sekä laskentamallin rakenne on esitetty työssä.

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 In the drilling processes and especially deep-hole drilling process, the monitoring system and having control on mechanical parameters (e.g. Force, Torque,Vibration and Acoustic emission) are essential. The main focus of this thesis work is to study the characteristics of deep-hole drilling process, and optimize the monitoring system for controlling the process. The vibration is considered as a major defect area of the deep-hole drilling process which often leads to breakage of the drill, therefore by vibration analysis and optimizing the workpiecefixture, this area is studied by finite element method and the suggestions are explained. By study on a present monitoring system, and searching on the new sensor products, the modifications and recommendations are suggested for optimize the present monitoring system for excellent performance in deep-hole drilling process research and measurements.

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Työ liittyy uuden sukupolven monitelakalanterin tuotekehitysprojektiin. Työssä tutkittiin uuden monitelakalanterin tuoterakennetta, esisuunnitteluaineistoa ja mahdol- lisuuksia parametriseen 3D-suunnitteluun. Työssä ei suoritettu teknistä laskentaa. Uuden monitelakalanterin modulaarinen tuoterakenne ja esisuunnitteluaineisto pohjautuu markkinoilla olevaan OptiLoad-monitelakalanteriin. Tuoterakenteella ja esisuunnitteluaineistolla ohjataan monitelakalantereiden asiakastoimitusprojekteissa eri kokoluokkien kustannuksia, suunnittelua ja tuotantoa. Modulaarisella tuoterakenteella, jolla on selkeät mitoitusperusteet vaikutetaan oleellisesti asiakastoimitusten luotettavuuteen. Huomioimalla tuotekehitysprojektissa asiakaskohtaiset muutokset modulaarisessa tuoterakenteessa voidaan tehdä alustava esisuunnitteluaineisto. Parametrinen 3D-suunnittelu sekä lopullinen esisuunnitteluaineisto vaatii uuden monitelakalanterin rakenteiden tuotteistusta, standardointia ja elementtimenetelmään perustuvaa lujuuslaskentaa.

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Paperitehtaissa paperin väriä arvioidaan L*a*b –arvojen perusteella. Tämä lähestymistapa ei ole tarkka ja johtaa siihen, että saman luokkaan kuuluvat paperit saatetaan havaita eri värisinä. Tässä diplomityössä tarkastellaan värien arviointia multispektraalisen kuvantamisen avulla. Menetelmän ajatuksena on verrata standardoidun heijastuman spektriä kohteena olevan paperirullan heijastuman spektriin mittaustapojen avulla. 12:n kirjallisuuteen perustuvan ja yhden tutkimusryhmämme kehittämän mittaustavan joukosta pyrittiin valitsemaan parhaat mittaustavat tutkimuksien perusteella. Mittaustavan tehokkuus tarkoittaa kykä tunnistaa eroavaisuuksia värisävyn, värikylläisyyden ja valoisuuden perusteella. Mittaustapoja tutkittiin sekä keinotekoisilla kuvilla että aidoilla paperinäytteillä. Tuloksena maksimi-minimi-, aritmeettisen keskiarvon minimi- ja geometrisen keskiarvon minimimenetelmä olivat parhaita mittaustapoja.

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Tutkielman aiheena on case-yrityksen kansainvälisen liiketoiminnan kehittäminen. Tutkielmassa selvitetään, minkälaisiin toimenpiteisiin case-yrityksen olisi liiketoiminnallisin perustein lähitulevaisuudessa ryhdyttävä sen ulkomaisten myyntiyhtiöiden suhteen vientitoimintaa kehitettäessä. Tarkastelunäkökulma on strategialähtöinen. Johdon päätöksenteon tarpeisiin tähtäävä käsittely painottuu strategian ja laskentatoimen välisen ajankohtaisen vuorovaikutuksen käsittelyyn. Tutkimus on kvalitatiivinen tapaustutkimus. Tutkimusmenetelmä on käytetty osallistuvaa havainnointia sekä haastatteluja. Tutkimuksen tulosten mukaan case-yrityksen tulisi muuttaa vientitoimintamalliaan nykyisestä tytäryhtiömuotoisesta toimintamallista hallinnollisesti ja kustannusrakenteellisesti kevyempään suuntaan. Kannattavuuden parantamiseksi suositellaan lisäksi strategisen johdon laskentatoimen menetelmistä asiakaskannattavuusanalyysin käyttöönottoa myyntiyhtiöiden kannattavimpien asiakkuuksien tunnistamiseksi, jotta niukat resurssit voitaisiin kohdistaa niihin asiakkaisiin, jotka synnyttävät enemmän myyntiä ja parempia tuottoja.

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A high-speed and high-voltage solid-rotor induction machine provides beneficial features for natural gas compressor technology. The mechanical robustness of the machine enables its use in an integrated motor-compressor. The technology uses a centrifugal compressor, which is mounted on the same shaft with the high-speed electrical machine driving it. No gearbox is needed as the speed is determined by the frequency converter. The cooling is provided by the process gas, which flows through the motor and is capable of transferring the heat away from the motor. The technology has been used in the compressors in the natural gas supply chain in the central Europe. New areas of application include natural gas compressors working at the wellheads of the subsea gas reservoir. A key challenge for the design of such a motor is the resistance of the stator insulation to the raw natural gas from the well. The gas contains water and heavy hydrocarbon compounds and it is far harsher than the sales gas in the natural gas supply network. The objective of this doctoral thesis is to discuss the resistance of the insulation to the raw natural gas and the phenomena degrading the insulation. The presence of partial discharges is analyzed in this doctoral dissertation. The breakdown voltage of the gas is measured as a function of pressure and gap distance. The partial discharge activity is measured on small samples representing the windings of the machine. The electrical field behavior is also modeled by finite element methods. Based on the measurements it has been concluded that the discharges are expected to disappear at gas pressures above 4 – 5 bar. The disappearance of discharges is caused by the breakdown strength of the gas, which increases as the pressure increases. Based on the finite element analysis, the physical length of a discharge seen in the PD measurements at atmospheric pressure was approximated to be 40 – 120 m. The chemical aging of the insulation when exposed to raw natural gas is discussed based on a vast set of experimental tests with the gas mixture representing the real gas mixture at the wellhead. The mixture was created by mixing dry hydrocarbon gas, heavy hydrocarbon compounds, monoethylene glycol, and water. The mixture was chosen to be more aggressive by increasing the amount of liquid substances. Furthermore, the temperature and pressure were increased, which resulted in accelerated test conditions. The time required to detect severe degradation was thus decreased. The test program included a comparison of materials, an analysis of the e ects of di erent compounds in the gas mixture, namely water and heavy hydrocarbons, on the aging, an analysis of the e ects of temperature and exposure duration, and also an analysis on the e ect of sudden pressure changes on the degradation of the insulating materials. It was found in the tests that an insulation consisting of mica, glass, and epoxy resin can tolerate the raw natural gas, but it experiences some degradation. The key material in the composite insulation is the resin, which largely defines the performance of the insulation system. The degradation of the insulation is mostly determined by the amount of gas mixture di used into it. The di usion was seen to follow Fick’s second law, but the coe cients were not accurately defined. The di usion was not sensitive to temperature, but it was dependent upon the thermodynamic state of the gas mixture, in other words, the amounts of liquid components in the gas. The weight increase observed was mostly related to heavy hydrocarbon compounds, which act as plasticizers in the epoxy resin. The di usion of these compounds is determined by the crosslink density of the resin. Water causes slight changes in the chemical structure, but these changes do not significantly contribute to the aging phenomena. Sudden changes in pressure can lead to severe damages in the insulation, because the motion of the di used gas is able to create internal cracks in the insulation. Therefore, the di usion only reduces the mechanical strength of the insulation, but the ultimate breakdown can potentially be caused by a sudden drop in the pressure of the process gas.

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The fatigue failure of structures under fluctuating loads in fillet weld joints raises a demand to determine the parameters related to this type of loading. In this study, the stress distribution in the susceptible area of weld toe and weld root in fillet welded models analyzed by finite element method applying FEMAP software. To avoid the geometrical singularity on the path of analytical stress analysis in the toe and root area of a weld model the effective notch stress approach applied by which a proper fictitious rounding that mostly depend on the material of structure is applied. The models with different weld toe waving width and radius are analyzed while the flank angle of weld varied in 45 and 30 degrees. The processed results shows that the waving compare to the straight weld toe makes differences in the value of stress and consequently the stress concentration factor between the tip and depth of the waves in the weld toe which helps to protect the crack of propagation and gives enough time and tools to be informed of the crack initiation in the structure during the periodical observation of structure. In the weld root study the analyses among the models with the welding penetration percentage from non-penetration to the full-penetration shows a slightly increase in the root area stress value which comparing with the stiffening effect of penetration conclude that the half-penetration can make an optimization between the stress increase and stiffening effect of deep penetration.

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Tutkimus on toimeksianto Yritykseltä X, joka halusi selvitettävän, millaista markkinapotentiaalia on nähtävissä ikäihmisten palveluasumisessa Suomessa asuville venäjänkielisille. Markkinoiden analysoinnin lisäksi tutkimuksessa on selvitetty kohderyhmän kuluttajakäyttäytymistä ja ostokykyä. Tutkimuksen tavoitteena ei ole antaa toimeksiantajalle valmista investointipäätöstä, vaan tuoda tietoa markkinoista ja kohderyhmästä päätöksenteon tueksi. Käytössä on ollut neljä empiiristä aineistoa. Primääriaineistona ovat asiantuntija¬haastattelut sekä kyselyt Yrityksen X venäjänkielisille työntekijöille ja maksaja-asiakkaille – eli kuntien ja sairaanhoitopiirien edustajille. Sekundääriaineistona on joukko suomalaisten Venäjä-asiantuntijoiden viime vuosien tutkimuksia. Pro gradun teoriaosuus on tiivis. Teorian on auttanut kirjoittajaa tarkastelemaan palveluasumisen markkinoita kansainvälisellä vivahteella sekä suomalaisittain uuden kuluttajaryhmän kuluttajakäyttäytymistä ja ostokykyä. Suomessa asuvia venäjänkielisiä ikäihmisiä ei ole aikaisemmassa tutkimuksessa tarkasteltu omana kohderyhmänään, mutta heistä on tehty paljon yhteiskunnallista tutkimusta. Tätä on hyödynnetty muun muassa tarkasteltaessa kohderyhmän kulttuurisia piirteitä, sosiaalisia tapoja, kieltä ja uskontoa. Suomessa asuvista venäjänkielisistä ikäihmistä ei voi puhua yhtenäisenä ryhmänä. Osa yli 65-vuotiaista on suomen kielen taitoisia ja työssään menestyneitä, mutta monen maahanmuuttajan sosiaalinen asema laski heidän muuttaessaan Suomeen. Neuvostoliitossa asuneet ovat tottuneet niukkoihin olosuhteisiin, siihen että samassa taloudessa asui jopa kolme sukupolvea, ja että perhe piti huolta yhteiskunnan tuen ollessa niukkaa. Vaikka venäläisessä kulttuurissa vanhainkodeilla on huono maine, voidaan Suomessa asuvien ikäihmisten keskuudessa nähdä positiivista suhtautumista palveluasumista ja suomalaisia julkispalveluja kohtaan. Mikäli Yritys X rakentaa yksikön Lappeenrantaan, kannattaa potentiaalisina asiakkaina nähdä myös venäläiset terveysmatkailijat ja suunnitella palvelutarjonta laajemmin kuin vain Suomessa asuville venäjänkielisille. Mikäli yksikkö tulee Helsinkiin, on kilpailijana ortodokseille ja venäjänkielisille vanhuksille tarkoitettu Helenan vanhainkoti.

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The capacity of beams is a very important factor in the study of durability of structures and structural members. The capacity of a high-strength steel I-beam made of S960 QC was investigated in this study. The investigation included assessment of the service limits and ultimate limits of the steel beam. The thesis was done according to European standards for steel structures, Eurocode 3. An analytical method was used to determine the throat thickness, deformation, elastic and plastic moment capacities as well as the fatigue life of the beam. The results of the analytical method were compared with those obtained by Finite Element Analysis (FEA). Elastic moment capacity obtained by the analytical method was 172 kNm. FEA and the analytical method predicted the maximum lateral-torsional buckling (LTB) capacity in the range of 90-93 kNm and the probability of failure as a result of LTB is estimated to be 50%. The lateral buckling capacity meant that the I-beam can carry a safe load of 300 kN instead of the initial load of 600 kN. The beam is liable to fail shortly after exceeding the elastic moment capacity. Based on results in of the different approaches, it was noted that FEA predicted higher deformation values on the load-deformation curve than the analytical results. However, both FEA and the analytical methods predicted identical results for nominal stress range and moment capacities. Fatigue life was estimated to be in the range of 53000-64000 cycles for bending stress range using crack propagation equation and strength-life approach. As Eurocode 3 is limited to steel grades up to S690, results for S960 must be verified with experimental data and appropriate design rules.

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This thesis is devoted to understanding and improving technologically important III-V compound semiconductor (e.g. GaAs, InAs, and InSb) surfaces and interfaces for devices. The surfaces and interfaces of crystalline III-V materials have a crucial role in the operation of field-effect-transistors (FET) and highefficiency solar-cells, for instance. However, the surfaces are also the most defective part of the semiconductor material and it is essential to decrease the amount of harmful surface or interface defects for the next-generation III-V semiconductor device applications. Any improvement in the crystal ordering at the semiconductor surface reduces the amount of defects and increases the material homogeneity. This is becoming more and more important when the semiconductor device structures decrease to atomic-scale dimensions. Toward that target, the effects of different adsorbates (i.e., Sn, In, and O) on the III-V surface structures and properties have been investigated in this work. Furthermore, novel thin-films have been synthesized, which show beneficial properties regarding the passivation of the reactive III-V surfaces. The work comprises ultra-high-vacuum (UHV) environment for the controlled fabrication of atomically ordered III-V(100) surfaces. The surface sensitive experimental methods [low energy electron diffraction (LEED), scanning tunneling microscopy/spectroscopy (STM/STS), and synchrotron radiation photoelectron spectroscopy (SRPES)] and computational density-functionaltheory (DFT) calculations are utilized for elucidating the atomic and electronic properties of the crucial III-V surfaces. The basic research results are also transferred to actual device tests by fabricating metal-oxide-semiconductor capacitors and utilizing the interface sensitive measurement techniques [capacitance voltage (CV) profiling, and photoluminescence (PL) spectroscopy] for the characterization. This part of the thesis includes the instrumentation of home-made UHV-compatible atomic-layer-deposition (ALD) reactor for growing good quality insulator layers. The results of this thesis elucidate the atomic structures of technologically promising Sn- and In-stabilized III-V compound semiconductor surfaces. It is shown that the Sn adsorbate induces an atomic structure with (1×2)/(1×4) surface symmetry which is characterized by Sn-group III dimers. Furthermore, the stability of peculiar ζa structure is demonstrated for the GaAs(100)-In surface. The beneficial effects of these surface structures regarding the crucial III-V oxide interface are demonstrated. Namely, it is found that it is possible to passivate the III-V surface by a careful atomic-scale engineering of the III-V surface prior to the gate-dielectric deposition. The thin (1×2)/(1×4)-Sn layer is found to catalyze the removal of harmful amorphous III-V oxides. Also, novel crystalline III-V-oxide structures are synthesized and it is shown that these structures improve the device characteristics. The finding of crystalline oxide structures is exploited by solving the atomic structure of InSb(100)(1×2) and elucidating the electronic structure of oxidized InSb(100) for the first time.

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Tässä diplomityössä esitetään voimalaitoksen kanavien kannakkeiden rakennesuunnittelussa tarvittavat laskentamenetelmät. Työssä rakenteiden suunnitteluun ja mitoitukseen käytetään pääasiassa Eurokoodi 3 teräsrakenteiden suunnittelustandardin mukaista rajatilamitoitusta. Lisäksi kehitetään mitoitustyökaluja tärkeimpien kanavakannakkeiden suunnitteluun. Toteutettujen mitoitustyökalujen toiminta verifioidaan lujuusopin elementtimenetelmällä tehtävin tarkistuslaskelmin. Laskentatyökalujen analyyttisen ratkaisun verifioitiin olevan varmalla puolella kaikissa tutkituissa ilmiöissä. Työssä verifioituja menetelmiä voidaan soveltaa myös muiden vastaavien rakenteiden mitoittamiseen. Työssä luotujen laskentatyökalujen sisältämät laskentamenetelmät mahdollistavat monenlaisten rakenteiden vaatimustenmukaisen suunnittelun.

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Tietointensiivisessä asiantuntijaorganisaatiossa henkilöstön osaaminen on tärkeä resurssi. Tämän tutkimuksen tavoitteena oli selvittää millaisena esimiehet ja johto näkevät ammatillisen osaamisen ja hiljaisen tiedon johtamisen nykytilan hajautetussa asiantuntijaorganisaatiossa. Tutkielman teoreettisessa osiossa esitettiin aiempia näkemyksiä asiantuntijaor-ganisaation osaamisen johtamisesta ja sen prosesseista. Asiantuntijatyön erityispiirteet, hajautetun organisaation erityispiirteet ja esimiestyön haasteet hajautetussa organisaatiossa otettiin huomioon tutkimuksen kontekstina. Tutkimus suoritettiin laadullisena tapaustutkimuksena asiantuntijaorganisaatiossa. Empiirinen aineisto kerättiin fokus-ryhmäkeskusteluin. Keskusteluihin osallistuivat kohdeorganisaation johto ja esimiehet. Empiiriset tulokset osoittivat, että osaamisen johtamisen haasteita ovat tiedon muuttunut luonne ja organisaation uudenlaiset toimintatavat. Asian-tuntijatyössä asiantuntijan oma vastuu osaamisen kehittämisessä korostuu enemmän kuin ennen ja esimiestyön haasteeksi muodostuukin hyvien olosuhteiden ja mahdollisuuksien järjestäminen osaamisen vahvistumisen tueksi. Tutkielman keskeisenä tuloksena ja toimenpide-ehdotuksena esitettiin osaamisen johtamisen tietoisempaa suunnittelua strategiatyössä. Esimiesten työtä osaamisen johtamisessa voidaan tukea nostamalla osaamisen tason tavoitteet ja keinot selkeämmin strategian tasolle ja selkiyttämällä asiantuntijoiden roolia osaamisen ylläpidossa ja kehittämisessä.